Division among Northern Ireland's pro-British and pro-Irish parties over
Brexit has prompted tactical electoral moves that put at risk some of the seats that had given the province's
Democratic Unionist Party (DUP) the balance of power in London.
The DUP, a mainly Protestant party that fervently favors continued
British rule of Northern
Ireland, used its 10 seats in parliament in
London to help keep Prime Minister Boris Johnson's Conservatives in power with a minority government.